And screening ores and fer



teniet gaat @than '(ftil'ilirr.

ALFRED nUvALL-or BALTIMQRE, MARYLAND.`

Letters Patent No. 107,169, dated September 6, 1870; antedated 'August 26, 1870.

IMPR-OVEMENT IN MACHINES FOR `TiASHIlINC-t .AND SCREENING`ORES AND FER-- TILIZERS.

The Schedule referred to in these Letters Patent and making part ofthe same.

.To all whom it may concern:

Be it known that I, ALFRED DUVALL, of the city and county of Baltimore and State of Maryland, have in vented certain Improvements in Machines for Washing and Screening Orcs and Fertilizers, &c.;` and I do hereby declare that the following is a full, clear, and exact description thereof', reference being had to the annexed drawing making part of this specification, in which-l o Figure 1 isa side elevation.

Figure 2 is an elevation of, the opposite side.

Figure 3 is a vertical section on the line x x, iig. 1..

Figure 4 is a horizontal section on theA line y y, fig. 3. l The same letters are used in all the figures to indicate identical parts.

My invention relates to a machine for washing and screening various substances, such as ores, phosphates, man nres, sand, and gravel, and other analogous uses; and' My improvement consists incombining, with a revolving dish on which the substances are rapidly 'rotated, a perforated screen, surrounding the former, through which the ner particles will pass by the centriiugal action, and in combining with the' revolving dish a'revolving diskl having ribs or fins attached, to carry' away the residuuin with the water. v

The special peculiarities claimed as novel will be set forth hereinafter.

A is a stout frame which supports-thc mechanism, properly braced and secured so as tosustain the saine.

The power is applied at B, in any convenient and usual manner, to give a rotary-motion to the horintal shaft B', turning in suitable boxes on the flame 0nl the end of the -shatt is a bevelwheel,0,

meshing into the horizontal bevel-pinion 1 ),-keyed todish carries the material to be operated upon, min-v gled with water, which is poured in a continuous stream upon it;

A -pertbrated metallic cylinder, G, surrounds and incloses the revolving dish. This cylinder I prefer to make of cast-iron, having numerous holes formed in it, hy inserting into the sand in the mold, small iron rods or wires, coated with black lead, cla'y wash, or other material, to prevent their adherence to the iron when cast, so that, when cast, they may be drawn out, leaving the cylinder with the proper perforations. The cylinder may, however, have the holes drilled or punched, or formed in any other convenient manner.

This perforated-cylinder is stationary, and fastened to the frame. It is inclosed by an outside casing, H,

to prevent the horizontal discharge of the Water about the. machine.

, The water and ner particles carried with it by the centrifugal action, passing through the perforated cylinder G, iiowsdown between the cylinder G and casits lower surface. in the form shown in figs. 3 and 4.v

These, catching the debris, carry it toward the periphery, to be swept with the water through the opening I into the discharge-trough.

When the materials placed in the revolving dish have, Vby thecentrifugal action, been properly cleaned of their finer impurities, by opening the sliding gate..

L, they will, as the dish revolves, be, by the centrifugal act-ion, ejected through the opening thus' made in the cylinder G, and discharged into the trough L.

I have shown, in lig. 2, at M, a combination of spur-wheels and screws, designed to be used in operating the gate L, but it is obvions'that many other equivalent devices may be substituted for the means here suggested. o Y

The gate may be operated by hand, or it may be connected with the driving-shaft by such suitable in- 'terveniug mechanism as will canse it to be opened automatically and' periodically.

What I claim as my invention, and desire to lsecure by Letters Patent, is

l. A machinefor washing and screening ores, Ste., combining in its construction a rotary.dish,`F, and perforated cylindrical screen G, substantially as set forth.

2. The combination of the rot-ary dish F,- perforated cylinder G, and ribbed disk K K',.substantially a's set forth.

3. The combination and arrangement ofthe rotary dish F, cylindrical screen G, casing H, disk K. and opening I, substantially as set forth.

4. ln combination with` rotary dish Fand perforated cyliuder G, a gate, L, suhstantaily as and for the purpose set forth.

ln testimony whereof I- have signed my name to thisspecitication in the presence of two subscribing witnesses.

ALFRED DUVALL.

Witnesses B. Enw. J. EILs', F. H. SPRAeun. 

